10 Science Page 6 Answers

NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations page 6 are given below. For other answers visit to Page 10 or Page 13 and Exercises in English or go for हिंदी मीडियम Solutions. Visit to Class 10 Science main page or move to Top of the page.

10 Science – Chemical Reactions and Equations

Some Important Questions with Answers

Question 1: What is meant by a skeletal chemical equation? Using suitable chemical reaction, differentiate between a skeletal chemical equation and a balanced chemical equation. Answer 1: If the number of atoms of any element in a chemical equation is not equal on both sides, then it is a skeletal equation. For example:

Here, the number of chlorine and hydrogen atoms are not equal on both sides. In a Balance equation, the numbers of atoms of different elements on both sides of a chemical equation are equal. For example:

Question 2: Explain the following terms with examples in each case: (i) Oxidation and (ii) Reduction. Answer 2: (i) Oxidation: it us a process (a) in which oxygen or any electronegative element is added up or (b) hydrogen or any electropositive element is removed. Examples are: (a)Sulphur burns in the air with a blue flame to form sulphur dioxide. Here oxygen is added up to sulphur.

(ii) Reduction: It is a process in which (a) Hydrogen or an electropositive element is added up.

(b) Oxygen or electronegative element is removed.

Examples are: (a)Hydrogen reacts with chlorine to form hydrogen chloride.

(b)Copper oxide is reduce with hydrogen.

Question 3: Why is respiration considered an exothermic reaction? Explain. Answer 3: During digestion, food is broken down into simpler substances. Food like rice, potato and bread are made up of carbohydrates. These carbohydrates are further broken down into glucose. Glucose during respiration (inhalation of oxygen) is oxidised with the liberation of energy as shown below: